MA-S: a /36 block (also called an OUI-36 assignment), IEEE's smallest, covering 4,096 addresses.
Prefix00:1B:C5:01:20:00 /36
Vendor address2-268 Sobudai Zama Kanagawa JP 252-8550
Country🇯🇵 Japan
RegisteredMar 31, 2013
Block range00:1B:C5:01:20:00– 00:1B:C5:01:2F:FF
Address capacity4,096
AdministrationUniversally administered: its prefix comes from a block registered through the IEEE Registration Authority
TransmissionUnicast: addressed to a single device
SourceIEEE Registration Authority
Address capacity is the size of this registered block, not a count of devices actually manufactured or online. Registration identifies the organization holding the block, not a specific device model or unit.
Curious how a prefix like this turns into a full address? See how MAC addresses are structured →
Example addresses in this block
Where this block sits
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00:1B:C5:01:10:00 /36
OOO NPP Mera
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00:1B:C5:01:30:00 /36
Zamir Recognition Systems Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Tokyo Cosmos Electric, Inc. holds 1 registered blocks in the IEEE registry, ranking #30,209 of 33,421 organizations by block count.